Re: [Xen-devel] [PATCH] xenbus: Neaten xenbus_va_dev_error

2017-02-08 Thread Joe Perches 
On Wed, 2017-02-08 at 12:14 -0500, Boris Ostrovsky wrote:
> On 02/08/2017 11:05 AM, Joe Perches wrote:
> > On Wed, 2017-02-08 at 10:33 -0500, Boris Ostrovsky wrote:
> > > On 02/08/2017 06:33 AM, Joe Perches wrote:
> > > > This function error patch can be simplified, so do so.
> > > > 
> > > > Remove fail: label and somewhat obfuscating, used once "error_path"
> > > > function.
> > 
> > btw: I left it alone, but likely
> > 
> > #define PRINTF_BUFFER_SIZE 4096
> > 
> > is probably excessive as the maximum printk
> > buffer is 1024.
> > 
> > The xenbus_write might be longer though so
> > maybe it's OK to use 4096, but there is some
> > inequivalence there.
> > 
> 
> xenbus_write() handles writes up to 4K. However we are filling the
> buffer with sprintf() which I assume is limited to 1K too

vsnprintf is bounded only by addressable memory. ie: (void *)-1

> so it indeed
> doesn't seem useful to have PRINTF_BUFFER_SIZE set to 4.
> 
> -boris
> 

___
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel

Re: [Xen-devel] [PATCH] xenbus: Neaten xenbus_va_dev_error

2017-02-08 Thread Boris Ostrovsky 
On 02/08/2017 11:05 AM, Joe Perches wrote:
> On Wed, 2017-02-08 at 10:33 -0500, Boris Ostrovsky wrote:
>> On 02/08/2017 06:33 AM, Joe Perches wrote:
>>> This function error patch can be simplified, so do so.
>>>
>>> Remove fail: label and somewhat obfuscating, used once "error_path"
>>> function.
> btw: I left it alone, but likely
>
> #define PRINTF_BUFFER_SIZE 4096
>
> is probably excessive as the maximum printk
> buffer is 1024.
>
> The xenbus_write might be longer though so
> maybe it's OK to use 4096, but there is some
> inequivalence there.
>

xenbus_write() handles writes up to 4K. However we are filling the
buffer with sprintf() which I assume is limited to 1K too so it indeed
doesn't seem useful to have PRINTF_BUFFER_SIZE set to 4.

-boris


___
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel

Re: [Xen-devel] [PATCH] xenbus: Neaten xenbus_va_dev_error

2017-02-08 Thread Joe Perches 
On Wed, 2017-02-08 at 10:33 -0500, Boris Ostrovsky wrote:
> On 02/08/2017 06:33 AM, Joe Perches wrote:
> > This function error patch can be simplified, so do so.
> > 
> > Remove fail: label and somewhat obfuscating, used once "error_path"
> > function.

btw: I left it alone, but likely

#define PRINTF_BUFFER_SIZE 4096

is probably excessive as the maximum printk
buffer is 1024.

The xenbus_write might be longer though so
maybe it's OK to use 4096, but there is some
inequivalence there.


___
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel

Re: [Xen-devel] [PATCH] xenbus: Neaten xenbus_va_dev_error

2017-02-08 Thread Boris Ostrovsky 
On 02/08/2017 06:33 AM, Joe Perches wrote:
> This function error patch can be simplified, so do so.
>
> Remove fail: label and somewhat obfuscating, used once "error_path"
> function.
>
> Signed-off-by: Joe Perches 

Applied to for-linus-4.11.

-boris

___
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel